Radius Gold Inc.: Metallurgical Tests on Tambor Sample Achieve Gold Recoveries of Up to 98%
Posted on: Monday, 11 February 2008, 09:00 CST
Simon Ridgway, the President of Radius Gold Inc. (TSX VENTURE: RDU)(OTCBB: RDUFF), is pleased to announce the results of metallurgical testwork performed on a 90kg sample collected from underground workings on the Guapinol South vein at Radius's Tambor gold project in Guatemala (see press release October 22, 2007). The tests evaluated:
1. the gold head grade and recovery by gravity concentration followed by cyanidation, and
2. the gold head grade and recovery by gravity concentration followed by froth flotation.
The study was undertaken by Dawson Metallurgical Laboratories, Utah, using a grind size of 80% passing 200 mesh or 75 microns.
The results were extremely encouraging and confirm the free milling, coarse grained nature of the gold at Tambor and its amenability to gravity pre-concentration as the principal method of recovery, followed by either cyanidation or flotation. The sample head grade ranged from 36 g/t to 40.7 g/t Au.
- Significant coarse free gold was liberated during the initial ball mill grind at 80% passing 92 microns, with individual grains ranging in size from 1,560 microns to minus 34 microns.
- Grinding, gravity concentration and amalgamation, followed by NaCN leach of slurry tails indicated a total gold recovery of 98% (head grade 40.7 g/t Au) with 55% of the total gold recovered during amalgamation (free gold grains), and 43% of the remaining gold recovered by cyanidation.
- Grinding, gravity concentration and amalgamation, followed by CIL (Carbon in Leach) indicated a total gold recovery of 97% (head grade 36.6 g/t Au), with 61% of the gold recovered by amalgamation and 36% from carbon in leaching of slurry tails.
- Grinding, gravity concentration and amalgamation, followed by flotation, indicate a total gold recovery of 86% (head grade 36.0 g/t Au), with gravity concentration recovering 64% of the gold and an additional 22% of the gold recovered by flotation of amalgamation tailings.
The test results are similar to those undertaken by Goldfields in 2003 on similar material from the Laguna Norte deposit.
Background on the Tambor Property
Radius owns 100% of the Tambor project which was discovered by Radius in 2000 and advanced by Gold Fields through a joint venture until 2003. The gold mineralization is classified as being of orogenic lode-gold type. Gold Fields drill tested the Guapinol, Laguna Norte, Poza del Coyote and Cliff zones, and a Technical Report prepared by Chlumsky, Armbrust and Meyer LLC (CAM) of Lakewood Colorado (see Radius news release dated December 10, 2003) outlined a 43-101 compliant resource of 216,000 ounces of gold in inferred resources (2.55 million tonnes @ 2.64 g/t Au) and 57,800 ounces in indicated resources (456,000 tonnes @ 3.94 g/t Au) in three separate zones. In 2007, an underground exploration drift and four cross cuts were completed at the Guapinol South zone, in order to provide information on the structural controls, continuity and grade of the high grade gold mineralization. Targets for further exploration include two parallel east-west trending +50ppb gold-in-soil anomalies over a 7km trend between Laguna North and Guapinol South.
The company is looking to advance the property through a combined development/exploration scenario with a joint venture partner.
Assay Protocol & Qualified Person
The scientific and technical information in this release was prepared under the supervision of Mr. David Cass, Radius' Vice-President of Exploration, who is a member of the Association of Professional Engineers and Geoscientists of British Columbia, and a "Qualified Person" in accordance with National Instrument 43-101.
ON BEHALF OF THE BOARD
Simon Ridgway, President
Shares Issued: 53.5-million
The TSX Venture Exchange has not reviewed and does not take responsibility for the adequacy or accuracy of this release.
Contacts: Radius Gold Inc. Ralph Rushton Investor Relations (604) 801-5432 or Toll Free: 1-888-627-9378 Radius Gold Inc. Erin Ostrom Investor Relations (604) 801-5432 or Toll Free: 1-888-627-9378 (604) 662-8829 (FAX) Email: info@radiusgold.com Website: www.radiusgold.com
SOURCE: Radius Gold Inc.
Source: MARKET WIRE
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